body{
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
}
.container{
    margin: 100px 0;
    text-align: center;
}
a{
    text-decoration: none;
}

.btn{
    display: inline-block;
    line-height: 30px;
    height: 30px;
    outline: 0;
    background-color: #eee;
    color: #333;
    padding: 5px 10px;
}
img{
    width: 640px;
}

.btn:hover{
    background-color: #ddd;
}